Multiple choice

In a class of 40 students in an examination in Mathmatics 4 students scored 100 marks 6 got zero and the average of the rest was 40.What is the average of the whole class?

  1. 40

  2. 60

  3. 120

  4. 80
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

4 students scored 100 marks (total 400), 6 scored 0 (total 0). Rest 30 students averaged 40 (total 1200). Total marks = 400 + 0 + 1200 = 1600. Average of 40 students = 1600/40 = 40. The 100s and 0s balance each other out relative to the 40 average.

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